These are Gunze cotton belly bands, very popular on Amazon and other sites. This is a set of two in black. They are made of a firm ribbed material, but are designed not to add bulk, making them ideal for those who prefer a less bulky feel (*^^*) They seem suitable for everyday use as well as outdoor activities. Although they are unused, they have been opened and stored for about 3 months, so please only purchase if you are not concerned about this.